Revised descriptions of New Zealand Cenozoic Mollusca from Beu and Maxwell (1990)
(Pl. 8c): GS9508, J40/f8803, McCulloch's Bridge, Kaiatan (GNS)
Beu & Maxwell (1990): Chapter 8; p. 118; pl. 8 c.
Synonymy: Ampullina waihaoensis Suter 1917, p. 11-12; Natica (Carinacca) waihaoensis
Type species of Carinacca Marwick, 1924
Classification: Naticidae: Naticinae
Description: Size moderate for family (height 15-20 mm), globose or broadly ovate, spire 0.2-0.3 total height. Protoconch large, depressed dome- shaped, of about 3 smooth whorls. Teleoconch whorls about 2, evenly convex except for an ill-defined sulcus below suture. Last whorl capacious, broadly umbilicate. Spiral sculpture of very fine threads or striae, present only on well-preserved shells, most prominent on last whorl including circumumbilical ridge and within umbilicus. Umbilicus bounded by a prominent, rounded ridge with sharply stepped inner edge. Aperture large, semilunular; inner lip almost straight, moderately thickened in parietal region, narrow adjacent to umbilicus except for weak thickening medially by low funicle. Outer lip strongly prosocline, inclined at about 40° from vertical.
Comparison: Very similar to its probable ancestor Carinacca allani (PI. 6h), but more globose, lower-spired and more broadly umbilicate, and having weakly sulcate teleoconch whorls.
Distribution: Bortonian-Kaiatan, Waihao Greensand, McCulloch's Bridge (type) (common); Hampden Formation, Hampden Beach (uncommon).
Cite this publication as: "A.G. Beu and J.I. Raine (2009). Revised
descriptions of New Zealand Cenozoic Mollusca from Beu and Maxwell (1990). GNS
Science miscellaneous series no. 27."
© GNS Science, 2009
(Included with a PDF facsimile file copy of New Zealand Geological Survey Paleontological Bulletin 58 in CD version from: Publications Officer, GNS Science, P.O. Box 30368 Lower Hutt, New Zealand)